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Soil Moisture

Soil Wetness Map

Data Access

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Data Version

  • Version 1.0 (beta)

Data Sources

  • SMAP L-band radiometer data

Processing Steps

  • Following are the three major processing steps :
  • i. SMAP L1C daily data.
  • ii. Import previous 3 days data
  • iii. Generate global mosaic of Tb
  • iv. Generate Indian mosaic of Tb
  • v. Generate SWI from Tb and gridding the data

Derivation Techniques and Algorithm

  • Soil Wetness Index (SWI) is derived using a time series based methodology using SMAP L-band radiometer data, normalized to the extreme values of 0 and 1, corresponding to the dry and saturated soil wetness conditions respectively.

File Naming Convention

  • The Geotiff file names follows naming convention;
  • Soil Wetness Index file:
  • SWI_SMAP_I_YYYYMMD1_YYYYMMD2.tif
  • SWI : Soil Wetness Index
  • SMAP : Soil Moisture Active Passive
  • I : India
  • YYYY : Year
  • MM : Month
  • D1 : Start Date
  • D2 : End Date
  • Soil Moisture file :
  • SWI_SMAP_I_YYYYMMD1_YYYYMMD2.tif
  • SWI : Soil Moisture
  • SMAP : Soil Moisture Active Passive
  • I : India
  • YYYY : Year
  • MM : Month
  • D1 : Start Date
  • D2 : End Date

MetaData

Sr. No Core Metadata Elements Definition
1 Metadata language English
2 Metadata Contact MOSDAC
3 Metadata date April, 2015
4 Data Lineage or Quality Soil Wetness Map derived using SMAP L-band Radiometer data
5 Title Soil Wetness Index.
6 Abstract Soil Wetness Index (SWI) is derived using a time series based methodology using SMAP L-band radiometer data, normalized to the extreme values of 0 and 1, corresponding to the dry and saturated soil wetness conditions respectively.
7 Dataset Contact Dharmendra Kumar Pandey, Sasmita Chaurasia, EPSA, Space Applications Centre (ISRO), Ahmedabad-380015, dkp@sac.isro.gov.in, sasmita@sac.isro.gov.in
8 Update frequency 3 day composite
9 Access Rights or Restriction Open Access
10 Spatial Resolution 40 km (resampled at 0.125 degrees)
11 Language English
12 Topic Category Land
13 Keywords Soil Wetness Index, SMAP. SWI, Soil Moisture Active Passive
14 Date or period April 2015
15 Responsible Party Dharmendra Kumar Pandey,EPSA, Space Applications Centre (ISRO), Ahmedabad-380015, India
16 Organization Space Applications Centre (ISRO), Ahmedabad, India
16a Org. role Geophysical parameters retrieval from satellite
16b Individual name Dharmendra Kumar pandeyEPSA, SAC (ISRO), Ahmedabad-380015, India. Ph: +91 79 2691 4005. Email: dkp@sac.isro.gov.in
16c Position Scientist/Engineer, EPSA, SAC (ISRO), Ahmedabad-380015, India. Ph: +91 79 2691 4005. Email: dkp@sac.isro.gov.in
17 Geographic Extent Indian Land mask
18 Geographic name, geographic Identifier Indian Region
19 Bounding box lat_min: 05N, lat_max: 24N, lon_min: 68E, lon_max: 90E
20 Temporal Extent April 2015 onwards
21 Access Rights or Restrictions Open Access
22 Distribution Information Online download in Geotiff format.
23 Processing Level Level 2
24 Reference System Datum: WGS84

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